资料来源 : pyDict

偷偷摸摸地

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Covertly \Cov"ert*ly\, adv.
   Secretly; in private; insidiously.

资料来源 : WordNet®

covertly
     adv : in a covert manner; "he did it covertly" [ant: {overtly}]